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                                <section class="normal markdown-section">
                                
                                <h1 id="mutation-observer-api">Mutation Observer API</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>Mutation Observer API &#x7528;&#x6765;&#x76D1;&#x89C6; DOM &#x53D8;&#x52A8;&#x3002;DOM &#x7684;&#x4EFB;&#x4F55;&#x53D8;&#x52A8;&#xFF0C;&#x6BD4;&#x5982;&#x8282;&#x70B9;&#x7684;&#x589E;&#x51CF;&#x3001;&#x5C5E;&#x6027;&#x7684;&#x53D8;&#x52A8;&#x3001;&#x6587;&#x672C;&#x5185;&#x5BB9;&#x7684;&#x53D8;&#x52A8;&#xFF0C;&#x8FD9;&#x4E2A; API &#x90FD;&#x53EF;&#x4EE5;&#x5F97;&#x5230;&#x901A;&#x77E5;&#x3002;</p>
<p>&#x6982;&#x5FF5;&#x4E0A;&#xFF0C;&#x5B83;&#x5F88;&#x63A5;&#x8FD1;&#x4E8B;&#x4EF6;&#xFF0C;&#x53EF;&#x4EE5;&#x7406;&#x89E3;&#x4E3A; DOM &#x53D1;&#x751F;&#x53D8;&#x52A8;&#x5C31;&#x4F1A;&#x89E6;&#x53D1; Mutation Observer &#x4E8B;&#x4EF6;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x5B83;&#x4E0E;&#x4E8B;&#x4EF6;&#x6709;&#x4E00;&#x4E2A;&#x672C;&#x8D28;&#x4E0D;&#x540C;&#xFF1A;&#x4E8B;&#x4EF6;&#x662F;&#x540C;&#x6B65;&#x89E6;&#x53D1;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;DOM &#x7684;&#x53D8;&#x52A8;&#x7ACB;&#x523B;&#x4F1A;&#x89E6;&#x53D1;&#x76F8;&#x5E94;&#x7684;&#x4E8B;&#x4EF6;&#xFF1B;Mutation Observer &#x5219;&#x662F;&#x5F02;&#x6B65;&#x89E6;&#x53D1;&#xFF0C;DOM &#x7684;&#x53D8;&#x52A8;&#x5E76;&#x4E0D;&#x4F1A;&#x9A6C;&#x4E0A;&#x89E6;&#x53D1;&#xFF0C;&#x800C;&#x662F;&#x8981;&#x7B49;&#x5230;&#x5F53;&#x524D;&#x6240;&#x6709; DOM &#x64CD;&#x4F5C;&#x90FD;&#x7ED3;&#x675F;&#x624D;&#x89E6;&#x53D1;&#x3002;</p>
<p>&#x8FD9;&#x6837;&#x8BBE;&#x8BA1;&#x662F;&#x4E3A;&#x4E86;&#x5E94;&#x4ED8; DOM &#x53D8;&#x52A8;&#x9891;&#x7E41;&#x7684;&#x7279;&#x70B9;&#x3002;&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;&#xFF0C;&#x5982;&#x679C;&#x6587;&#x6863;&#x4E2D;&#x8FDE;&#x7EED;&#x63D2;&#x5165;1000&#x4E2A;<code>&lt;p&gt;</code>&#x5143;&#x7D20;&#xFF0C;&#x5C31;&#x4F1A;&#x8FDE;&#x7EED;&#x89E6;&#x53D1;1000&#x4E2A;&#x63D2;&#x5165;&#x4E8B;&#x4EF6;&#xFF0C;&#x6267;&#x884C;&#x6BCF;&#x4E2A;&#x4E8B;&#x4EF6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x8FD9;&#x5F88;&#x53EF;&#x80FD;&#x9020;&#x6210;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x5361;&#x987F;&#xFF1B;&#x800C; Mutation Observer &#x5B8C;&#x5168;&#x4E0D;&#x540C;&#xFF0C;&#x53EA;&#x5728;1000&#x4E2A;&#x6BB5;&#x843D;&#x90FD;&#x63D2;&#x5165;&#x7ED3;&#x675F;&#x540E;&#x624D;&#x4F1A;&#x89E6;&#x53D1;&#xFF0C;&#x800C;&#x4E14;&#x53EA;&#x89E6;&#x53D1;&#x4E00;&#x6B21;&#x3002;</p>
<p>Mutation Observer &#x6709;&#x4EE5;&#x4E0B;&#x7279;&#x70B9;&#x3002;</p>
<ul>
<li>&#x5B83;&#x7B49;&#x5F85;&#x6240;&#x6709;&#x811A;&#x672C;&#x4EFB;&#x52A1;&#x5B8C;&#x6210;&#x540E;&#xFF0C;&#x624D;&#x4F1A;&#x8FD0;&#x884C;&#xFF08;&#x5373;&#x5F02;&#x6B65;&#x89E6;&#x53D1;&#x65B9;&#x5F0F;&#xFF09;&#x3002;</li>
<li>&#x5B83;&#x628A; DOM &#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#x5C01;&#x88C5;&#x6210;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x8FDB;&#x884C;&#x5904;&#x7406;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4E00;&#x6761;&#x6761;&#x4E2A;&#x522B;&#x5904;&#x7406; DOM &#x53D8;&#x52A8;&#x3002;</li>
<li>&#x5B83;&#x65E2;&#x53EF;&#x4EE5;&#x89C2;&#x5BDF; DOM &#x7684;&#x6240;&#x6709;&#x7C7B;&#x578B;&#x53D8;&#x52A8;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x53EA;&#x89C2;&#x5BDF;&#x67D0;&#x4E00;&#x7C7B;&#x53D8;&#x52A8;&#x3002;</li>
</ul>
<h2 id="mutationobserver-&#x6784;&#x9020;&#x51FD;&#x6570;">MutationObserver &#x6784;&#x9020;&#x51FD;&#x6570;</h2>
<p>&#x4F7F;&#x7528;&#x65F6;&#xFF0C;&#x9996;&#x5148;&#x4F7F;&#x7528;<code>MutationObserver</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x65B0;&#x5EFA;&#x4E00;&#x4E2A;&#x89C2;&#x5BDF;&#x5668;&#x5B9E;&#x4F8B;&#xFF0C;&#x540C;&#x65F6;&#x6307;&#x5B9A;&#x8FD9;&#x4E2A;&#x5B9E;&#x4F8B;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> observer = <span class="hljs-keyword">new</span> MutationObserver(callback);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x4F1A;&#x5728;&#x6BCF;&#x6B21; DOM &#x53D8;&#x52A8;&#x540E;&#x8C03;&#x7528;&#x3002;&#x8BE5;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x7B2C;&#x4E00;&#x4E2A;&#x662F;&#x53D8;&#x52A8;&#x6570;&#x7EC4;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x662F;&#x89C2;&#x5BDF;&#x5668;&#x5B9E;&#x4F8B;&#xFF0C;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> observer = <span class="hljs-keyword">new</span> MutationObserver(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">mutations, observer</span>) </span>{
  mutations.forEach(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">mutation</span>) </span>{
    <span class="hljs-built_in">console</span>.log(mutation);
  });
});
</code></pre>
<h2 id="mutationobserver-&#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;">MutationObserver &#x7684;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;</h2>
<h3 id="observe">observe()</h3>
<p><code>observe</code>&#x65B9;&#x6CD5;&#x7528;&#x6765;&#x542F;&#x52A8;&#x76D1;&#x542C;&#xFF0C;&#x5B83;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x3002;</p>
<ul>
<li>&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF1A;&#x6240;&#x8981;&#x89C2;&#x5BDF;&#x7684; DOM &#x8282;&#x70B9;</li>
<li>&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF1A;&#x4E00;&#x4E2A;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#xFF0C;&#x6307;&#x5B9A;&#x6240;&#x8981;&#x89C2;&#x5BDF;&#x7684;&#x7279;&#x5B9A;&#x53D8;&#x52A8;</li>
</ul>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> article = <span class="hljs-built_in">document</span>.querySelector(<span class="hljs-string">&apos;article&apos;</span>);

<span class="hljs-keyword">var</span>  options = {
  <span class="hljs-string">&apos;childList&apos;</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-string">&apos;attributes&apos;</span>:<span class="hljs-literal">true</span>
} ;

observer.observe(article, options);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>observe</code>&#x65B9;&#x6CD5;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x7B2C;&#x4E00;&#x4E2A;&#x662F;&#x6240;&#x8981;&#x89C2;&#x5BDF;&#x7684;DOM&#x5143;&#x7D20;&#x662F;<code>article</code>&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x662F;&#x6240;&#x8981;&#x89C2;&#x5BDF;&#x7684;&#x53D8;&#x52A8;&#x7C7B;&#x578B;&#xFF08;&#x5B50;&#x8282;&#x70B9;&#x53D8;&#x52A8;&#x548C;&#x5C5E;&#x6027;&#x53D8;&#x52A8;&#xFF09;&#x3002;</p>
<p>&#x89C2;&#x5BDF;&#x5668;&#x6240;&#x80FD;&#x89C2;&#x5BDF;&#x7684; DOM &#x53D8;&#x52A8;&#x7C7B;&#x578B;&#xFF08;&#x5373;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;<code>options</code>&#x5BF9;&#x8C61;&#xFF09;&#xFF0C;&#x6709;&#x4EE5;&#x4E0B;&#x51E0;&#x79CD;&#x3002;</p>
<ul>
<li><strong>childList</strong>&#xFF1A;&#x5B50;&#x8282;&#x70B9;&#x7684;&#x53D8;&#x52A8;&#xFF08;&#x6307;&#x65B0;&#x589E;&#xFF0C;&#x5220;&#x9664;&#x6216;&#x8005;&#x66F4;&#x6539;&#xFF09;&#x3002;</li>
<li><strong>attributes</strong>&#xFF1A;&#x5C5E;&#x6027;&#x7684;&#x53D8;&#x52A8;&#x3002;</li>
<li><strong>characterData</strong>&#xFF1A;&#x8282;&#x70B9;&#x5185;&#x5BB9;&#x6216;&#x8282;&#x70B9;&#x6587;&#x672C;&#x7684;&#x53D8;&#x52A8;&#x3002;</li>
</ul>
<p>&#x60F3;&#x8981;&#x89C2;&#x5BDF;&#x54EA;&#x4E00;&#x79CD;&#x53D8;&#x52A8;&#x7C7B;&#x578B;&#xFF0C;&#x5C31;&#x5728;<code>option</code>&#x5BF9;&#x8C61;&#x4E2D;&#x6307;&#x5B9A;&#x5B83;&#x7684;&#x503C;&#x4E3A;<code>true</code>&#x3002;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x5FC5;&#x987B;&#x540C;&#x65F6;&#x6307;&#x5B9A;<code>childList</code>&#x3001;<code>attributes</code>&#x548C;<code>characterData</code>&#x4E2D;&#x7684;&#x4E00;&#x79CD;&#x6216;&#x591A;&#x79CD;&#xFF0C;&#x82E5;&#x672A;&#x5747;&#x6307;&#x5B9A;&#x5C06;&#x62A5;&#x9519;&#x3002;</p>
<p>&#x9664;&#x4E86;&#x53D8;&#x52A8;&#x7C7B;&#x578B;&#xFF0C;<code>options</code>&#x5BF9;&#x8C61;&#x8FD8;&#x53EF;&#x4EE5;&#x8BBE;&#x5B9A;&#x4EE5;&#x4E0B;&#x5C5E;&#x6027;&#xFF1A;</p>
<ul>
<li><code>subtree</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x662F;&#x5426;&#x5C06;&#x8BE5;&#x89C2;&#x5BDF;&#x5668;&#x5E94;&#x7528;&#x4E8E;&#x8BE5;&#x8282;&#x70B9;&#x7684;&#x6240;&#x6709;&#x540E;&#x4EE3;&#x8282;&#x70B9;&#x3002;</li>
<li><code>attributeOldValue</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x89C2;&#x5BDF;<code>attributes</code>&#x53D8;&#x52A8;&#x65F6;&#xFF0C;&#x662F;&#x5426;&#x9700;&#x8981;&#x8BB0;&#x5F55;&#x53D8;&#x52A8;&#x524D;&#x7684;&#x5C5E;&#x6027;&#x503C;&#x3002;</li>
<li><code>characterDataOldValue</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x89C2;&#x5BDF;<code>characterData</code>&#x53D8;&#x52A8;&#x65F6;&#xFF0C;&#x662F;&#x5426;&#x9700;&#x8981;&#x8BB0;&#x5F55;&#x53D8;&#x52A8;&#x524D;&#x7684;&#x503C;&#x3002;</li>
<li><code>attributeFilter</code>&#xFF1A;&#x6570;&#x7EC4;&#xFF0C;&#x8868;&#x793A;&#x9700;&#x8981;&#x89C2;&#x5BDF;&#x7684;&#x7279;&#x5B9A;&#x5C5E;&#x6027;&#xFF08;&#x6BD4;&#x5982;<code>[&apos;class&apos;,&apos;src&apos;]</code>&#xFF09;&#x3002;</li>
</ul>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x5F00;&#x59CB;&#x76D1;&#x542C;&#x6587;&#x6863;&#x6839;&#x8282;&#x70B9;&#xFF08;&#x5373;&lt;html&gt;&#x6807;&#x7B7E;&#xFF09;&#x7684;&#x53D8;&#x52A8;</span>
mutationObserver.observe(<span class="hljs-built_in">document</span>.documentElement, {
  attributes: <span class="hljs-literal">true</span>,
  characterData: <span class="hljs-literal">true</span>,
  childList: <span class="hljs-literal">true</span>,
  subtree: <span class="hljs-literal">true</span>,
  attributeOldValue: <span class="hljs-literal">true</span>,
  characterDataOldValue: <span class="hljs-literal">true</span>
});
</code></pre>
<p>&#x5BF9;&#x4E00;&#x4E2A;&#x8282;&#x70B9;&#x6DFB;&#x52A0;&#x89C2;&#x5BDF;&#x5668;&#xFF0C;&#x5C31;&#x50CF;&#x4F7F;&#x7528;<code>addEventListener</code>&#x65B9;&#x6CD5;&#x4E00;&#x6837;&#xFF0C;&#x591A;&#x6B21;&#x6DFB;&#x52A0;&#x540C;&#x4E00;&#x4E2A;&#x89C2;&#x5BDF;&#x5668;&#x662F;&#x65E0;&#x6548;&#x7684;&#xFF0C;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4F9D;&#x7136;&#x53EA;&#x4F1A;&#x89E6;&#x53D1;&#x4E00;&#x6B21;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x6307;&#x5B9A;&#x4E0D;&#x540C;&#x7684;<code>options</code>&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x4F1A;&#x88AB;&#x5F53;&#x4F5C;&#x4E24;&#x4E2A;&#x4E0D;&#x540C;&#x7684;&#x89C2;&#x5BDF;&#x5668;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x662F;&#x89C2;&#x5BDF;&#x65B0;&#x589E;&#x7684;&#x5B50;&#x8282;&#x70B9;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> insertedNodes = [];
<span class="hljs-keyword">var</span> observer = <span class="hljs-keyword">new</span> MutationObserver(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">mutations</span>) </span>{
  mutations.forEach(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">mutation</span>) </span>{
    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; mutation.addedNodes.length; i++) {
      insertedNodes.push(mutation.addedNodes[i]);
    }
  });
  <span class="hljs-built_in">console</span>.log(insertedNodes);
});
observer.observe(<span class="hljs-built_in">document</span>, { childList: <span class="hljs-literal">true</span>, subtree: <span class="hljs-literal">true</span> });
</code></pre>
<h3 id="disconnect&#xFF0C;takerecords&#xFF08;&#xFF09;">disconnect()&#xFF0C;takeRecords&#xFF08;&#xFF09;</h3>
<p><code>disconnect</code>&#x65B9;&#x6CD5;&#x7528;&#x6765;&#x505C;&#x6B62;&#x89C2;&#x5BDF;&#x3002;&#x8C03;&#x7528;&#x8BE5;&#x65B9;&#x6CD5;&#x540E;&#xFF0C;DOM &#x518D;&#x53D1;&#x751F;&#x53D8;&#x52A8;&#xFF0C;&#x4E5F;&#x4E0D;&#x4F1A;&#x89E6;&#x53D1;&#x89C2;&#x5BDF;&#x5668;&#x3002;</p>
<pre><code class="lang-javascript">observer.disconnect();
</code></pre>
<p><code>takeRecords</code>&#x65B9;&#x6CD5;&#x7528;&#x6765;&#x6E05;&#x9664;&#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#xFF0C;&#x5373;&#x4E0D;&#x518D;&#x5904;&#x7406;&#x672A;&#x5904;&#x7406;&#x7684;&#x53D8;&#x52A8;&#x3002;&#x8BE5;&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#x7684;&#x6570;&#x7EC4;&#x3002;</p>
<pre><code class="lang-javascript">observer.takeRecords();
</code></pre>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4FDD;&#x5B58;&#x6240;&#x6709;&#x6CA1;&#x6709;&#x88AB;&#x89C2;&#x5BDF;&#x5668;&#x5904;&#x7406;&#x7684;&#x53D8;&#x52A8;</span>
<span class="hljs-keyword">var</span> changes = mutationObserver.takeRecords();

<span class="hljs-comment">// &#x505C;&#x6B62;&#x89C2;&#x5BDF;</span>
mutationObserver.disconnect();
</code></pre>
<h2 id="mutationrecord-&#x5BF9;&#x8C61;">MutationRecord &#x5BF9;&#x8C61;</h2>
<p>DOM &#x6BCF;&#x6B21;&#x53D1;&#x751F;&#x53D8;&#x5316;&#xFF0C;&#x5C31;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x6761;&#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#xFF08;MutationRecord &#x5B9E;&#x4F8B;&#xFF09;&#x3002;&#x8BE5;&#x5B9E;&#x4F8B;&#x5305;&#x542B;&#x4E86;&#x4E0E;&#x53D8;&#x52A8;&#x76F8;&#x5173;&#x7684;&#x6240;&#x6709;&#x4FE1;&#x606F;&#x3002;Mutation Observer &#x5904;&#x7406;&#x7684;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x4E2A;<code>MutationRecord</code>&#x5B9E;&#x4F8B;&#x6240;&#x7EC4;&#x6210;&#x7684;&#x6570;&#x7EC4;&#x3002;</p>
<p><code>MutationRecord</code>&#x5BF9;&#x8C61;&#x5305;&#x542B;&#x4E86;DOM&#x7684;&#x76F8;&#x5173;&#x4FE1;&#x606F;&#xFF0C;&#x6709;&#x5982;&#x4E0B;&#x5C5E;&#x6027;&#xFF1A;</p>
<ul>
<li><code>type</code>&#xFF1A;&#x89C2;&#x5BDF;&#x7684;&#x53D8;&#x52A8;&#x7C7B;&#x578B;&#xFF08;<code>attributes</code>&#x3001;<code>characterData</code>&#x6216;&#x8005;<code>childList</code>&#xFF09;&#x3002;</li>
<li><code>target</code>&#xFF1A;&#x53D1;&#x751F;&#x53D8;&#x52A8;&#x7684;DOM&#x8282;&#x70B9;&#x3002;</li>
<li><code>addedNodes</code>&#xFF1A;&#x65B0;&#x589E;&#x7684;DOM&#x8282;&#x70B9;&#x3002;</li>
<li><code>removedNodes</code>&#xFF1A;&#x5220;&#x9664;&#x7684;DOM&#x8282;&#x70B9;&#x3002;</li>
<li><code>previousSibling</code>&#xFF1A;&#x524D;&#x4E00;&#x4E2A;&#x540C;&#x7EA7;&#x8282;&#x70B9;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x5219;&#x8FD4;&#x56DE;<code>null</code>&#x3002;</li>
<li><code>nextSibling</code>&#xFF1A;&#x4E0B;&#x4E00;&#x4E2A;&#x540C;&#x7EA7;&#x8282;&#x70B9;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x5219;&#x8FD4;&#x56DE;<code>null</code>&#x3002;</li>
<li><code>attributeName</code>&#xFF1A;&#x53D1;&#x751F;&#x53D8;&#x52A8;&#x7684;&#x5C5E;&#x6027;&#x3002;&#x5982;&#x679C;&#x8BBE;&#x7F6E;&#x4E86;<code>attributeFilter</code>&#xFF0C;&#x5219;&#x53EA;&#x8FD4;&#x56DE;&#x9884;&#x5148;&#x6307;&#x5B9A;&#x7684;&#x5C5E;&#x6027;&#x3002;</li>
<li><code>oldValue</code>&#xFF1A;&#x53D8;&#x52A8;&#x524D;&#x7684;&#x503C;&#x3002;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#x53EA;&#x5BF9;<code>attribute</code>&#x548C;<code>characterData</code>&#x53D8;&#x52A8;&#x6709;&#x6548;&#xFF0C;&#x5982;&#x679C;&#x53D1;&#x751F;<code>childList</code>&#x53D8;&#x52A8;&#xFF0C;&#x5219;&#x8FD4;&#x56DE;<code>null</code>&#x3002;</li>
</ul>
<h2 id="&#x5E94;&#x7528;&#x793A;&#x4F8B;">&#x5E94;&#x7528;&#x793A;&#x4F8B;</h2>
<h3 id="&#x5B50;&#x5143;&#x7D20;&#x7684;&#x53D8;&#x52A8;">&#x5B50;&#x5143;&#x7D20;&#x7684;&#x53D8;&#x52A8;</h3>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x8BF4;&#x660E;&#x5982;&#x4F55;&#x8BFB;&#x53D6;&#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> callback = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">records</span>)</span>{
  records.map(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">record</span>)</span>{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Mutation type: &apos;</span> + record.type);
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Mutation target: &apos;</span> + record.target);
  });
};

<span class="hljs-keyword">var</span> mo = <span class="hljs-keyword">new</span> MutationObserver(callback);

<span class="hljs-keyword">var</span> option = {
  <span class="hljs-string">&apos;childList&apos;</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-string">&apos;subtree&apos;</span>: <span class="hljs-literal">true</span>
};

mo.observe(<span class="hljs-built_in">document</span>.body, option);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x89C2;&#x5BDF;&#x5668;&#xFF0C;&#x89C2;&#x5BDF;<code>&lt;body&gt;</code>&#x7684;&#x6240;&#x6709;&#x4E0B;&#x7EA7;&#x8282;&#x70B9;&#xFF08;<code>childList</code>&#x8868;&#x793A;&#x89C2;&#x5BDF;&#x5B50;&#x8282;&#x70B9;&#xFF0C;<code>subtree</code>&#x8868;&#x793A;&#x89C2;&#x5BDF;&#x540E;&#x4EE3;&#x8282;&#x70B9;&#xFF09;&#x7684;&#x53D8;&#x52A8;&#x3002;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4F1A;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x663E;&#x793A;&#x6240;&#x6709;&#x53D8;&#x52A8;&#x7684;&#x7C7B;&#x578B;&#x548C;&#x76EE;&#x6807;&#x8282;&#x70B9;&#x3002;</p>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x53D8;&#x52A8;">&#x5C5E;&#x6027;&#x7684;&#x53D8;&#x52A8;</h3>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x8BF4;&#x660E;&#x5982;&#x4F55;&#x8FFD;&#x8E2A;&#x5C5E;&#x6027;&#x7684;&#x53D8;&#x52A8;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> callback = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">records</span>) </span>{
  records.map(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">record</span>) </span>{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Previous attribute value: &apos;</span> + record.oldValue);
  });
};

<span class="hljs-keyword">var</span> mo = <span class="hljs-keyword">new</span> MutationObserver(callback);

<span class="hljs-keyword">var</span> element = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;#my_element&apos;</span>);

<span class="hljs-keyword">var</span> options = {
  <span class="hljs-string">&apos;attributes&apos;</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-string">&apos;attributeOldValue&apos;</span>: <span class="hljs-literal">true</span>
}

mo.observe(element, options);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5148;&#x8BBE;&#x5B9A;&#x8FFD;&#x8E2A;&#x5C5E;&#x6027;&#x53D8;&#x52A8;&#xFF08;<code>&apos;attributes&apos;: true</code>&#xFF09;&#xFF0C;&#x7136;&#x540E;&#x8BBE;&#x5B9A;&#x8BB0;&#x5F55;&#x53D8;&#x52A8;&#x524D;&#x7684;&#x503C;&#x3002;&#x5B9E;&#x9645;&#x53D1;&#x751F;&#x53D8;&#x52A8;&#x65F6;&#xFF0C;&#x4F1A;&#x5C06;&#x53D8;&#x52A8;&#x524D;&#x7684;&#x503C;&#x663E;&#x793A;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x3002;</p>
<h3 id="&#x53D6;&#x4EE3;-domcontentloaded-&#x4E8B;&#x4EF6;">&#x53D6;&#x4EE3; DOMContentLoaded &#x4E8B;&#x4EF6;</h3>
<p>&#x7F51;&#x9875;&#x52A0;&#x8F7D;&#x7684;&#x65F6;&#x5019;&#xFF0C;DOM &#x8282;&#x70B9;&#x7684;&#x751F;&#x6210;&#x4F1A;&#x4EA7;&#x751F;&#x53D8;&#x52A8;&#x8BB0;&#x5F55;&#xFF0C;&#x56E0;&#x6B64;&#x53EA;&#x8981;&#x89C2;&#x5BDF; DOM &#x7684;&#x53D8;&#x52A8;&#xFF0C;&#x5C31;&#x80FD;&#x5728;&#x7B2C;&#x4E00;&#x65F6;&#x95F4;&#x89E6;&#x53D1;&#x76F8;&#x5173;&#x4E8B;&#x4EF6;&#xFF0C;&#x4E5F;&#x5C31;&#x6CA1;&#x6709;&#x5FC5;&#x8981;&#x4F7F;&#x7528;<code>DOMContentLoaded</code>&#x4E8B;&#x4EF6;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> observer = <span class="hljs-keyword">new</span> MutationObserver(callback);
observer.observe(<span class="hljs-built_in">document</span>.documentElement, {
  childList: <span class="hljs-literal">true</span>,
  subtree: <span class="hljs-literal">true</span>
});
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x76D1;&#x542C;<code>document.documentElement</code>&#xFF08;&#x5373;&#x7F51;&#x9875;&#x7684;<code>&lt;html&gt;</code>HTML &#x8282;&#x70B9;&#xFF09;&#x7684;&#x5B50;&#x8282;&#x70B9;&#x7684;&#x53D8;&#x52A8;&#xFF0C;<code>subtree</code>&#x5C5E;&#x6027;&#x6307;&#x5B9A;&#x76D1;&#x542C;&#x8FD8;&#x5305;&#x62EC;&#x540E;&#x4EE3;&#x8282;&#x70B9;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x4EFB;&#x610F;&#x4E00;&#x4E2A;&#x7F51;&#x9875;&#x5143;&#x7D20;&#x4E00;&#x65E6;&#x751F;&#x6210;&#xFF0C;&#x5C31;&#x80FD;&#x7ACB;&#x523B;&#x88AB;&#x76D1;&#x542C;&#x5230;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x7528;<code>MutationObserver</code>&#x5BF9;&#x8C61;&#x5C01;&#x88C5;&#x4E00;&#x4E2A;&#x76D1;&#x542C; DOM &#x751F;&#x6210;&#x7684;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript">(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">win</span>)</span>{
<span class="hljs-meta">  &apos;use strict&apos;</span>;

  <span class="hljs-keyword">var</span> listeners = [];
  <span class="hljs-keyword">var</span> doc = win.document;
  <span class="hljs-keyword">var</span> MutationObserver = win.MutationObserver || win.WebKitMutationObserver;
  <span class="hljs-keyword">var</span> observer;

  <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ready</span>(<span class="hljs-params">selector, fn</span>)</span>{
    <span class="hljs-comment">// &#x50A8;&#x5B58;&#x9009;&#x62E9;&#x5668;&#x548C;&#x56DE;&#x8C03;&#x51FD;&#x6570;</span>
    listeners.push({
      selector: selector,
      fn: fn
    });
    <span class="hljs-keyword">if</span>(!observer){
      <span class="hljs-comment">// &#x76D1;&#x542C;document&#x53D8;&#x5316;</span>
      observer = <span class="hljs-keyword">new</span> MutationObserver(check);
      observer.observe(doc.documentElement, {
        childList: <span class="hljs-literal">true</span>,
        subtree: <span class="hljs-literal">true</span>
      });
    }
    <span class="hljs-comment">// &#x68C0;&#x67E5;&#x8BE5;&#x8282;&#x70B9;&#x662F;&#x5426;&#x5DF2;&#x7ECF;&#x5728;DOM&#x4E2D;</span>
    check();
  }

  <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">check</span>(<span class="hljs-params"></span>)</span>{
  <span class="hljs-comment">// &#x68C0;&#x67E5;&#x662F;&#x5426;&#x5339;&#x914D;&#x5DF2;&#x50A8;&#x5B58;&#x7684;&#x8282;&#x70B9;</span>
    <span class="hljs-keyword">for</span>(<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; listeners.length; i++){
      <span class="hljs-keyword">var</span> listener = listeners[i];
      <span class="hljs-comment">// &#x68C0;&#x67E5;&#x6307;&#x5B9A;&#x8282;&#x70B9;&#x662F;&#x5426;&#x6709;&#x5339;&#x914D;</span>
      <span class="hljs-keyword">var</span> elements = doc.querySelectorAll(listener.selector);
      <span class="hljs-keyword">for</span>(<span class="hljs-keyword">var</span> j = <span class="hljs-number">0</span>; j &lt; elements.length; j++){
        <span class="hljs-keyword">var</span> element = elements[j];
        <span class="hljs-comment">// &#x786E;&#x4FDD;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x53EA;&#x4F1A;&#x5BF9;&#x8BE5;&#x5143;&#x7D20;&#x8C03;&#x7528;&#x4E00;&#x6B21;</span>
        <span class="hljs-keyword">if</span>(!element.ready){
          element.ready = <span class="hljs-literal">true</span>;
          <span class="hljs-comment">// &#x5BF9;&#x8BE5;&#x8282;&#x70B9;&#x8C03;&#x7528;&#x56DE;&#x8C03;&#x51FD;&#x6570;</span>
          listener.fn.call(element, element);
        }
      }
    }
  }

  <span class="hljs-comment">// &#x5BF9;&#x5916;&#x66B4;&#x9732;ready</span>
  win.ready = ready;

})(<span class="hljs-keyword">this</span>);

<span class="hljs-comment">// &#x4F7F;&#x7528;&#x65B9;&#x6CD5;</span>
ready(<span class="hljs-string">&apos;.foo&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">element</span>)</span>{
  <span class="hljs-comment">// ...</span>
});
</code></pre>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Paul Kinlan, <a href="https://developers.google.com/web/updates/2012/02/Detect-DOM-changes-with-Mutation-Observers" target="_blank" rel="nofollow">Detect DOM changes with Mutation Observers</a></li>
<li>Tiffany Brown, <a href="http://dev.opera.com/articles/view/mutation-observers-tutorial/" target="_blank" rel="nofollow">Getting to know mutation observers</a></li>
<li>Michal Budzynski, <a href="http://michalbe.blogspot.com/2013/04/javascript-less-known-parts-dom.html" target="_blank" rel="nofollow">JavaScript: The less known parts. DOM Mutations</a></li>
<li>Jeff Griffiths, <a href="https://hacks.mozilla.org/2012/05/dom-mutationobserver-reacting-to-dom-changes-without-killing-browser-performance/" target="_blank" rel="nofollow">DOM MutationObserver &#x2013; reacting to DOM changes without killing browser performance</a></li>
<li>Addy Osmani, <a href="http://addyosmani.com/blog/mutation-observers/" target="_blank" rel="nofollow">Detect, Undo And Redo DOM Changes With Mutation Observers</a></li>
<li>Ryan Morr, <a href="http://ryanmorr.com/using-mutation-observers-to-watch-for-element-availability/" target="_blank" rel="nofollow">Using Mutation Observers to Watch for Element Availability</a></li>
</ul>




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